My Companion Cube Puzzle Box is now for sale! I had to tweak it a lot to make it work properly, to be able to sell it. As a surprise, I added a CAKE inside. But it is a lie, the cake is actually another box that opens up to reveal a mini cube on the inside.

Yeah, it's expensive because they charge by volume, I did everything possible to hollow out pieces, trim thick walls, make it as light as possible, but it is a lot of material so the price couldn't be reduced more than that.